42 knots to miles per hour
48.33 mph
42 kn = 48.33 mph.
miles per hour
48.33mph
42 kn = 48.33 mph
In short
How many miles per hour is 42 knots?
42 kn = 48.33 mph. 1 knot = 1.150779 miles per hour, so the working is 42 × 1.150779 = 48.33.
The working
The factor below is an exact definition rather than a measurement, so nothing is approximated in the arithmetic. The only rounding on this page happens where a number is displayed.
1 knot = 1.150779 miles per hour 42 × 1.150779 = 48.33
How much precision do you need?
Each row is the same answer cut at a different number of decimals, with what that choice costs you. Pick the shortest row whose error is smaller than whatever you are measuring with.
| Rounded to | Answer (mph) | Off by |
|---|---|---|
| Whole number | 48 | −0.33274 |
| 1 decimal | 48.3 | −0.03274 |
| 2 decimals | 48.33 | −0.00274 |
Round trip: take 48.33 mph back the other way and you land on 41.9976 kn — a drift of 0.0024 kn. That gap is the rounding, not the conversion.
Frequently asked questions
What is 42 knots in miles per hour?
42 knots is 48.33 miles per hour. 1 knot = 1.150779 miles per hour, so the working is 42 × 1.150779 = 48.33.
How accurate is 48.33 mph?
Rounding to 48.33 mph and converting straight back gives 41.9976 kn, a drift of 0.0024 kn from the 42 you started with. The factor itself is exact; every bit of that difference comes from the rounding, not the conversion.
Nearby values
Any value at all
Knots to MPH Converter
Convert knots to miles per hour — boat speed, wind speed, and aviation.
Open the knots to MPH converter →